Method for making an ambient light curable ethylene propylene diene terpolymer rubber coating devoid of thermally activated accelerators

ABSTRACT

A durable ambient light curable waterproof liquid rubber coating with volatile organic compound (VOC) content of less than 450 grams per liter made from ethylene propylene diene terpolymer (EPDM) in a solvent, a photoinitiator, an additive, pigments, and fillers, and a co-agent and a method for making the formulation, wherein the formulation is devoid of thermally activated accelerators.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application claims priority to and the benefit of co-pending U.S. Provisional Patent Application Ser. No. 61/764,471 filed on Feb. 13, 2013, entitled “AMBIENT LIGHT CURABLE ETHYLENE PROPYLENE DIENE MONOMER RUBBER COATING DEVOID OF THERMALLY ACTIVATED ACCELERATORS”; co-pending U.S. Provisional Patent Application Ser. No. 61/764,479 filed on Feb. 13, 2013, entitled “DUAL CURABLE ETHYLENE PROPYLENE DIENE MONOMER RUBBER COATING USING A PHOTOINITIATOR AND A PEROXIDE”; and co-pending U.S. Provisional Patent Application Ser. No. 61/764,483 filed on Feb. 13, 2013, entitled “HIGH SOLIDS LOW VOC CONTENT ETHYLENE PROPYLENE DIENE RUBBER COATING.” These references are hereby incorporated in their entirety.

FIELD

The present embodiments generally relate to a method for making ambient light curable liquid ethylene propylene diene terpolymer rubber coating compositions with a volatile organic compound content of less than 450 grams per liter.

BACKGROUND

A need exists for a method for making a one component system ambient temperature waterproof rubber coating.

A need exists for a method for making an ambient temperature waterproof rubber coating that requires no active heat for curing.

A further need exists for a method for making an ethylene propylene diene terpolymer (EPDM) waterproof rubber coating formed from a liquid that does not require isocyanates or similar toxic chemicals.

A need exists for a method for making a formulation that can be applied to existing roofs and existing substrates as a “cool white easily applied waterproof rubber coating” to lower the costs of energy and reduce maintenance costs of a facility.

The present embodiments meet these needs.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Before explaining the present method in detail, it is to be understood that the method is not limited to the particular embodiments and that it can be practiced or carried out in various ways.

The present embodiments generally relate to a method for making ethylene propylene diene terpolymer rubber coating compositions that are consumer friendly to use and require no additional mixing of a curing agent as a two component system.

The present embodiments relate to a method for making a durable ambient light curable waterproof liquid rubber coating with volatile organic compound (VOC) content of less than 450 grams per liter, such as without benzene or xylene.

A benefit of the method is that the liquid rubber coating produced from the method is ambient temperature curable and devoid of thermally activated accelerators, so that through simple exposure to ambient light, the liquid rubber coating curing is initiated without the need to add an additional component or to add active heat to cure the rubber formulation.

A benefit of the method is that the liquid EPDM formulation produced by the method is easy to apply in the field since it is a liquid and no heat source is needed to cure the formulation.

A benefit of the method is that users of the liquid EPDM formulation produced by the method will avoid the possibility of having second or third degree burns from applying the composition, because the coating is “heat free” to cure on a substrate which can be a roofing tile or flat roof base material. The formulation produced from the method does not “hold heat” but reflects heat.

A liquid EPDM formulation produced from the method creates a cured coating that has (1) waterproof sealing to resist hurricane strength rainfall; (2) resistance to acid rain degradation allowing at least 15 years useful life for a roof in an acid rain area; (3) ability to withstand cold temperatures of down to −50 degrees Centigrade, such as Arctic weather.

A durable ambient light curable waterproof rubber liquid coating formulation produced from the method does not require isocyanates or similar toxic curing agents which are known to have a harmful effect on people as evidenced by allergic sensitization to isocyanates.

A durable ambient light curable waterproof liquid rubber coating formulation produced from the method can be applied to existing roofs and existing substrates as a “cool white roof” material lowering the cost of building maintenance, lowering the cost of energy, and reducing the dependence of the United States on foreign oil.

Schools, hospitals, public housing facilities, warehouses, residential homes, and facilities for the elderly can benefit from a durable ambient light curable waterproof liquid rubber coating formulation produced from the method, on the roofs of their institutions because the material will remain cool, while simultaneously sealing the roof, providing a reflective surface to reduce costs of energy and costs of maintaining the facilities.

A cured material produced from the method can extend the life of a roof, reducing the need for roof replacement.

In other embodiments, the formulation produced from the method can be used to seal docks for marinas.

Another benefit of the method is that the cros slinking reaction creating cured material is initiated in the presence of ambient light which can be a light frequency that is visible, ultraviolet, or infrared, causing the formulation produced from the method to be simple to use.

The method saves time in application of the coating as no additional equipment is needed to mix the formulation produced from the method prior to application on the roof substrate, the dock, or another intended substrate.

A benefit of a durable ambient light curable waterproof liquid rubber coating formulation produced from the method is that the invention is stable in its packaging system for delivery to a user.

The following terms are used herein:

The term “active heating” as used herein can refer to the external addition of energy to the formulation by the use of heat generating devices, such as adding energy through mechanical means with heated application hoses, infrared lamps, heat guns, or by adding heat using an extruder.

The term “additive” as used herein can refer to an antioxidant, an ultraviolet light stabilizer, or combinations thereof.

The term “adhesion promoter” as used herein can refer to a component made from molecules that tie the formed ambient light curable EPDM coating to a substrate for enhanced bonding. An example of an adhesion promoter can be SARET® 633 or 634 made by Arkema France.

The term “air release agent” can refer to mineral oil, paraffinic oil, silicone oil, or similar oil. An example of paraffinic oil can be FHR ULTRA® made by Flint Hills Resources of Wichita, Kans., an example of a mineral oil can be UNIQFORM™ made by UniqChem UK Co., Ltd., and an example of an air release agent can be BYK®-320 made by BYK-Chemie GmbH of Germany.

The term “ambient light” as used herein can refer to visible, ultraviolet or near infrared light. The range of wavelength from ultraviolet to near infrared light can range in wavelength from 200 nanometers to 1500 nanometers.

The term “ambient temperature” as used herein can refer to a temperature less than 50 degrees Celsius and equal to or greater than −10 degrees Celsius.

The term “antioxidant” can refer to a hindered phenolic stabilizer, such as IRGANOX® 1076 made by Ciba Specialty Chemicals Corporation of Tarrytown, N.Y.

The term “anti-settling agent” as used herein can refer to an agent that prevents the settling of pigments and fillers in a liquid formulation. An example of a usable anti-settling agent can be M-P-A® made by Elementis Specialties, Inc. of Hightstown, N.J. Another example is a hydroxyethyl cellulose. Still another example is a fumed silica.

The term “biocide” can be a variety of ingredients. A methylchloroisothiazolinone, such as MERGAL® K9N made by Troy Corporation or ROCIMA™ 363 available from Dow Chemical of Midland, Mich. can be used.

The term “co-agent” as the term is used herein can refer to a reactive molecule with two or more functional groups, for bonding with an EPDM molecule. The co-agent can enhance crosslinking between two EPDM molecules initiated by a photoinitiator. The term “enhances” can refer to an accelerated process of crosslinking. Co-agent accelerates reaction of the free radicals with the active sites of the unsaturated diene to cross link the terpolymer.

Usable co-agents can include an acrylate such as hexane diol diacrylate, polybutadiene acrylate, a triallyl cyanurate, polybutadiene, and phenylenedimaleimide known as VAMAC® DP HVA-2 available from E.I. DuPont of Wilmington, Del.

The term “defoamer” as used herein can refer to components, such as polymethyl alkyl siloxane. An example of a defoamer can be BYK®-A500 defoamer. Defoamers can include modified polysiloxane or polymethylsiloxane in solvents such as BYK®-066 N or BYK®-052 made by BYK-Chemie GmbH of Germany.

The term “flame retardant” as referred to herein can refer to a liquid or a powder flame retardant. The powdered version can be used in the method at a different blending point than the liquid version. An example of a flame retardant usable herein is alumina trihydrate. Flame retardants can be used as fillers in this invention. Flame retardants can be used as pigments in this invention.

The term “inert atmosphere” as used herein can refer to an atmosphere placed over the reaction using an inert gas such as nitrogen or argon.

The term “low shear” as used herein can refer to mixing at a blade tip speed of less than 2500 linear feet per minute used in the mixing device.

The term “molecular weight” for the polymer as used herein can refer to a weight average molecular weight as determined by gel permeation chromatography (GPC) measurement.

The term “photoinitiator” as used herein can refer to photoinitiators that are devoid of thermally activated accelerators.

Usable photoinitiators include type I photoinitiators which can include: bis(2,4,6-trimethylbenzoyl)-phenyl phosphineoxide, known as IRGACURE® 819 and 1-hydroxy-cyclohexyl-phenyl-ketone known as IRGACURE® 184 made by BASF Corporation.

Type II photoinitiators can be usable and can include benzophenone, alpha hydroxyl ketone, alpha amino ketone, isothioxanthone, and combinations thereof. All photoinitiators can remain devoid of thermally activated accelerators.

The term “pigment dispersant” can refer to a chemical that allows pigment to remain homogenously dispersed in the coating. Examples of usable pigment dispersants include NUOSPERSE® 9100 available from Elementis Specialties, Inc.

The term “plant-based solvent” can refer to vegetable based, grass based, weed based, nut based, or food based solvents including but not limited to methyl soyate. Only solvents that dissolve EPDM or one of the other polymers are usable herein.

The term “plasticizer” as used herein can refer to non-volatile plasticizers, including paraffinic oil, silicone oil, naphthenic oil, plant based oil, diester oil, mineral oil, a low molecular weight polyalpha olefin, or combinations thereof.

The term “terpolymer” as used herein can refer to a polymer of ethylene, propylene, and one or more non-conjugated dienes. Examples of non-conjugated diene usable herein can include norbornene, ethylidene norbornene, 1,4, hexadiene, dicyclopentadiene, vinyl norbornene, methylene norbornene, and combinations thereof.

In other embodiments, the terpolymer of ethylene, propylene and one or more non-conjugated dienes can have the propylene replaced by another alpha olefin, such as but not limited to 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, or combinations thereof.

In embodiments, the “polymer” can be ethylene propylene polymer, ethylene butene polymer, ethylene pentene polymer, or combinations thereof.

“Solvents” as the term is used herein can refer to an aliphatic solvent, an aromatic solvent, or a plant based solvent with a density from 0.6 to 1.2 grams per cubic centimeter. Examples of usable solvents include mineral spirits, toluene, hexane, xylene, hexamethyldi-siloxane, or combinations thereof.

The term “thermally activated accelerator” as the term is used herein can refer to accelerators which require temperatures above ambient temperatures to cure an EPDM coating and specifically require “active heating.”

In a formulation produced by the method, no thermally activated accelerators are used, which is a feature of this method.

The term “ultraviolet stabilizers” can refer to chemicals such as hindered amine light stabilizers, benzotriazoles, or similar components.

The term “waterproof” as used herein can refer to a moisture vapor permeation rating of less than 1.

The term “wetting agent” can refer to chemicals such as DISPONEk™ 983 available from Elementis Specialties, Inc.

Wetting agents can include silicone polyacrylate copolymer in solvents such as BYK®-3550 or a solvent-free polyether modified dimethylpolysiloxane such as BYK®-378 made by BYK-Chemie GmbH of Germany.

A formulation produced by the method can be coated onto various substrates. Substrates that are usable with this formed ambient light curable waterproof liquid rubber coating can include roofs, aged PVC materials, aged EPDM roofing materials, aged thermoplastic olefin materials, metal, glass, car port roofs, docks, concrete, polyurethane foam, acrylate material system, wood, oil rig mats, and high impact devices.

The embodiments can include a method for making a durable ambient light curable waterproof liquid rubber formulation with a volatile organic compound (VOC) content of less than 450 grams per liter.

The method involves blending in a closed vessel forming a solution, a first portion of ethylene propylene diene terpolymer (EPDM) with a first portion of solvent, wherein the ethylene propylene diene terpolymer (EPDM) is 50 weight percent to 99 weight percent of a total amount of ethylene propylene diene terpolymer used in a resulting durable ambient light curable waterproof liquid rubber formulation and the first portion of solvents is 33 weight percent to 67 weight percent of a total amount of solvent used in the resulting durable ambient light curable waterproof liquid rubber formulation.

The second step involves mixing the solution in a high shear mixer for at least 10 to 240 minutes at a temperature from 20 degrees Celsius to 50 degrees Celsius forming a high viscosity solution.

As a third step, a second portion of ethylene propylene diene terpolymer (EPDM) is added to the high viscosity solution, wherein the second portion of ethylene propylene diene terpolymer (EPDM) is 0.1 weight percent to 50 weight percent of the total amount of ethylene propylene diene terpolymer (EPDM) used in the resulting durable ambient light curable waterproof liquid rubber formulation.

Next, a second portion of solvent is added to the high viscosity solution wherein the second portion of solvent is 33 weight percent to 80 weight percent of a total amount of solvent used in the resulting durable ambient light curable waterproof liquid rubber formulation.

As a fifth step, the high viscosity solution is blended for 10 minutes to 120 minutes at a temperature from 20 degrees Celsius to 50 degrees Celsius to form a low viscosity liquid intermediate rubber formulation with a saturated backbone of propylene, a saturated backbone of ethylene, and an unsaturated diene with ultra violet activated sites capable of crosslinking with or reacting with a free radical or a free radical on another terpolymer.

For a sixth step, a co-agent is added to the low viscosity liquid intermediate rubber formulation to accelerate reaction of the free radicals with the active sites of the unsaturated diene to cross link the terpolymer, wherein the co-agent is 0.01 weight percent to 10 weight percent of the resulting durable ambient light curable waterproof liquid rubber formulation and the co-agent comprises at least one of: an acrylate, a triallyl cyanurate, a polybutadiene, and a phenylenedimaleimide.

As a seventh step, the low viscosity liquid intermediate rubber formulation is blended with the co-agent at a low shear rate for 10 minutes to 120 minutes at a temperature from 20 degrees Celsius to 50 degrees Celsius in the absence of ultraviolet light.

As the eighth step, a photoinitiator devoid of thermally activated accelerators is added to the low viscosity liquid intermediate rubber formulation to generate free radicals that react with the active sites of the unsaturated diene, wherein the photoinitiator is 0.1 weight percent to 10 weight percent of the resulting durable ambient light curable waterproof liquid rubber formulation; forming a durable ambient light curable waterproof liquid rubber formulation devoid of thermally activated accelerators and adapted to crosslink and form a waterproof seal on a substrate only in the presence of ultraviolet light.

In embodiments, the method can also involve mixing the photoinitiators in a photoinitiator solvent prior to adding the photoinitiators to the low viscosity liquid intermediate rubber formulation, wherein the photoinitiator solvent is from 1 weight percent to 20 weight percent based on the total solvent content of the resulting durable ambient light curable waterproof liquid rubber formulation.

Photoinitiators include Type I photoinitiators including: bis(2,4,6-trimethylbenzoyl)-phenyl phosphineoxide, and 1-hydroxy-cyclohexyl-phenyl-ketone.

Photoinitiators include Type II photoinitiators including benzophenone, alpha hydroxyl ketone, alpha amino ketone, isothioxanthone, and combinations thereof. All photoinitiators are devoid of thermally activated accelerators.

In embodiments, the first portion of ethylene propylene diene terpolymer can have a different molecular weight than the second portion of ethylene propylene diene terpolymer.

In other embodiments, the method can involve adding to the high viscosity solution, at a temperature from 20 degrees Celsius to 50 degrees Celsius, at least one of: (a) 50 weight percent to 99 weight percent of a pigment, and (b) 50 weight percent to 99 weight percent of a filler.

The amount of the pigment and the filler added represent a total weight percent of pigment and filler in the high viscosity solution.

The method involves blending the pigment and filler to a particle dispersion from 4 to 8 units on the Hegman scale.

In further embodiments, this method can involve adding to the low viscosity liquid intermediate 0.1 weight percent to 10 weight percent of additives based on a total weight of the resulting durable ambient light curable waterproof liquid rubber formulation.

The additives are at least one of: a hindered phenolic stabilizer or a hindered amine ultraviolet stabilizer.

The method can also involve adding to the low viscosity liquid intermediate 0.1 weight percent to 10 weight percent of an adhesion promoter based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation after adding the second portion of EPDM to the high viscosity solution.

The adhesion promoter is at least one of: a zinc diacrylate or a zinc dimethacrylate.

In embodiments, the method can involve adding to the low viscosity liquid intermediate rubber formulation: 0.1 weight percent to 10 weight percent of a pigment dispersant based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation.

The pigment dispersant can be 1 methoxy-2-propylacetate.

In further embodiments, the method can involve adding to the low viscosity liquid intermediate rubber formulation: 0.1 weight percent to 10 weight percent of an anti-settling agent based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation.

The anti-settling agent is at least one of a hydroxylethyl cellulose and a fumed silica.

In other embodiments, the method can involve adding to the low viscosity liquid intermediate rubber formulation 0.1 weight percent to 10 weight percent of a defoamer based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation.

The defoamer can be at least one of: a polymethyl alkyl siloxane, a modified polysiloxane, and a polymethylsiloxane in a solvent.

In embodiments, the method can involve adding to the low viscosity liquid intermediate rubber formulation 0.1 weight percent to 10 weight percent of an air release agent based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation.

The air release agent can be at least one of: a mineral oil, a paraffinic oil, a silicone oil, or a similar oil.

In further embodiments, the method can involve adding 0.1 weight percent to 30 weight percent of a flame retardant to low viscosity liquid intermediate rubber formulation, based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation.

The flame retardant can be: an alumina trihydrate. Flame retardants can be added to: a pigment, or a filler, and optionally an additive and then to the low viscosity liquid intermediate rubber formulation or after the second portion of ethylene propylene diene terpolymer is added to the high viscosity solution.

In still more embodiments, the method can involve adding to the low viscosity liquid intermediate rubber formulation 0.1 weight percent to 12 weight percent of a wetting agent based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation.

The wetting agent can be at least one of: a silicone polyacrylate copolymer in solvent and a solvent-free polyether modified dimethylpolysiloxane.

The method can also involve adding to the low viscosity liquid intermediate rubber formulation 0.1 weight percent to 10 weight percent of a biocide based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation.

The biocide can be a methylchloroisothiazolinone.

In embodiments, the method can involve adding 0.1 weight percent to 30 weight percent of a low molecular weight non-volatile plasticizer low viscosity liquid intermediate rubber formulation after the second portion of solvent is added to the high shear mixture.

The low molecular weight non-volatile plasticizer can be a paraffinic oil, naphthenic oil, plant based oil, diester oil, silicone oil, a mineral oil, a low molecular weight polyalphaolefin, or combinations thereof.

In embodiments, the solvents can be selected from the group: mineral spirits and hexamethyldi-siloxane.

In embodiments, the first and second solvent portions can be different solvents.

In other embodiments, a durable ambient light curable waterproof liquid rubber coating formulation with a volatile organic compound content of less than 450 grams per liter can be formed by first blending in a closed vessel forming a solution, a first portion of ethylene propylene diene terpolymer (EPDM) with a first portion of solvent wherein the ethylene propylene diene terpolymer (EPDM) is 50 weight percent to 99 weight percent of a total amount of ethylene propylene diene terpolymer and the first portion of solvent is 33 weight percent to 67 weight percent of a total amount of solvent used in a resulting formulation.

In other embodiments, as a second step the method can involve adding to the solution 0.25 weight percent to 20 weight percent of a pigment based on a total weight of the resulting formulation and 0.25 weight percent to 50 weight percent of a filler based on a total weight of the resulting formulation to form a mixture.

As a third step, the method can involve mixing the mixture in a high shear mixer at a temperature from 20 degrees Celsius to 50 degrees Celsius until the mixture forms a grinding base with a Hegman scale value from 4 to 8 with dispersed pigment and filler.

As a fourth step, the method can involve adding a second portion of ethylene propylene diene terpolymer (EPDM) to the grinding base, wherein the second portion of ethylene propylene diene terpolymer (EPDM) is 1 weight percent to 50 weight percent of the total amount of ethylene propylene diene terpolymer (EPDM) used in a resulting durable ambient light curable waterproof liquid rubber coating formulation.

As a fifth step, the method can involve adding a second portion of solvent to the grinding base and blending until all components are uniformly blended at a temperature from 20 degrees Celsius to 40 degrees Celsius forming an intermediate, wherein the second portion of solvent is 33 weight percent to 67 weight percent of the total amount of solvent used in a resulting formulation.

In embodiments, as a sixth step, the method can involve adding 0.01 weight percent to 10 weight percent of a co-agent to the intermediate, wherein the co-agent is comprises at least one of: an acrylate, a triallyl cyanurate, a polybutadiene, or a phenylenedimaleimide, and blending the intermediate with the co-agent at a low shear rate for 10 minutes to 120 minutes at a temperature from 20 degrees Celsius to 40 degrees Celsius in the absence of ultraviolet light.

In further embodiments, as a seventh step, the method can involve adding 0.1 weight percent to 10 weight percent of a photoinitiator devoid of thermally activated accelerators to the intermediate and forming a durable ambient light curable waterproof liquid rubber formulation devoid of thermally activated accelerators, wherein the formulation is adapted to crosslink and form a waterproof seal on a substrate only in the presence of ultraviolet light.

The coating can be formed by first blending in a closed vessel forming a solution, a first portion of EPDM with a first portion of solvent, wherein the EPDM is 50 weight percent to 99 weight percent of a total amount of ethylene propylene diene terpolymer (EPDM) and the first portion of solvent is 33 weight percent to 67 weight percent of a total amount of solvent used in the resulting formulation.

As a second step, various components can be added to the solution, such as (i) 0.25 weight percent to 20 weight percent of a pigment based on a total weight of the resulting formulation; (ii) 0.25 weight percent to 50 weight percent of a filler based on a total weight of the resulting formulation to form a mixture; and (iii) 0.5 weight percent to 10 weight percent of additives based on a total weight of the resulting formulation. These three components can be added while mixing the solution in a high shear mixer for at least 10 minutes to 240 minutes at a temperature from 20 degrees Celsius to 50 degrees Celsius forming a high shear mixture.

As a third step, a second portion of EPDM can be added to the high shear mixture, wherein the second portion of EPDM can be 0.1 weight percent to 50 weight percent of the total amount of EPDM used in the resulting formulation.

As a fourth step, a second portion of solvent can be added to the high shear mixture and blended for 10 minutes to 60 minutes at a temperature from 20 degrees Celsius to 40 degrees Celsius to form an intermediate, wherein the second portion of solvent can be 33 weight percent to 67 weight percent of the total amount of solvent used in the resulting formulation.

As a fifth step, a photoinitiator can be added to the intermediate wherein the photoinitiator is 0.1 weight percent to 10 weight percent of the resulting formulation.

As a sixth step, a co-agent can be added to the intermediate wherein the co-agent is 0.01 weight percent to 10 weight percent of the resulting formulation, and wherein the co-agent comprises at least one of: an acrylate, a triallyl cyanurate, a polybutadiene, a phenylenedimaleimide, and combinations thereof.

The photoinitiator and the co-agent can be added while continuing to blend the intermediate with the co-agent at a low shear rate for 10 minutes to 120 minutes at a temperature from 20 degrees Celsius to 40 degrees Celsius in the absence of light forming the durable ambient light curable waterproof liquid rubber coating devoid of thermally activated accelerators, wherein the durable ambient light curable waterproof liquid rubber formulation is adapted to form a waterproof seal on a substrate in the presence of light.

In an embodiment, the method can use a first portion of EPDM with a different molecular weight than the second portion of EPDM.

In an embodiment, the method can involve the mixing of the pigments and fillers with the EPDM in an inert atmosphere.

In an embodiment, the method can involve adding 0.1 weight percent to 5 weight percent of an adhesion promoter based on the total weight of the resulting formulation after adding the second portion of EPDM to the high shear mixture.

In still another embodiment, the method can involve adding 0.1 weight percent to 5 weight percent of a pigment dispersant based on the total weight of the resulting formulation, before adding the pigments, fillers, and additives.

In an embodiment, the method can include adding 0.1 weight percent to 5 weight percent of an anti-settling agent based on the total weight of the resulting formulation, after the second portion of EPDM is added to the high shear mixture.

In an embodiment, the method can involve adding 0.1 weight percent to 3 weight percent of a defoamer based on the total weight of the resulting formulation, after pigment, filler and additive addition.

In an embodiment, the method can involve adding 0.1 weight percent to 3 weight percent of an air release agent based on the total weight of the resulting formulation after the second portion of EPDM is added to the high shear mixture.

In yet another embodiment, the method can involve adding 0.1 weight percent to 30 weight percent of a flame retardant based on the total weight of the resulting formulation, either (a) with the pigment, filler, and additives, or (b) after the second portion of EPDM is added to the high shear mixture.

In an embodiment, the method can involve adding 0.1 weight percent to 5 weight percent of a wetting agent based on the total weight of the resulting formulation, after the second portion of EPDM is added to the high shear mixture.

The method can also involve adding 0.1 weight percent to 3 weight percent of a biocide based on the total weight of the resulting formulation, after the second portion of EPDM is added to the high shear mixture.

In an embodiment, the method can include adding 0.1 weight percent to 30 weight percent of a low molecular weight non-volatile plasticizer based on the total weight of the resulting formulation, after the second portion of solvent is added to the high shear mixture, wherein the low molecular weight non-volatile plasticizer comprises: a paraffinic oil, naphthenic oil, plant based oil, diester oil, silicone oil, a mineral oil, a low molecular weight polyalphaolefin, or combinations thereof.

The invention can include creating a special waterproof formulation with low volatile organic compound content. The volatile organic compound content can be less than 450 and as low as 0.1 volatile organic content grams per liter.

In further embodiments the formulation can be for a durable ambient light curable waterproof liquid rubber coating formulation with a volatile organic compound content of less than 450 grams per liter.

This formulation can be comprised of a first portion of ethylene propylene diene terpolymer (EPDM), wherein the ethylene propylene diene terpolymer (EPDM) is 50 weight percent to 99 weight percent of a total amount of ethylene propylene diene terpolymer.

This formulation can further be comprised of a first portion of solvent, wherein the first portion of solvent is 33 weight percent to 67 weight percent of a total amount of solvent used in a resulting formulation.

Additionally, this formulation can be comprised of 0.25 weight percent to 20 weight percent of a pigment based on a total weight of the resulting formulation.

Further, this formulation can be comprised of 0.25 weight percent to 50 weight percent of a filler based on a total weight of the resulting formulation.

This formulation can be further comprised of 1 weight percent to 50 weight percent of ethylene propylene diene terpolymer (EPDM) based on a total weight of the resulting formulation.

The formulation can also be comprised of 33 weight percent to 67 weight percent of a second portion of solvent based on a total weight of the resulting formulation.

Further, the formulation can be comprised of 0.01 weight percent to 10 weight percent of a co-agent based on a total weight of the resulting formulation, wherein the co-agent is comprises at least one of: an acrylate, a triallyl cyanurate, a polybutadiene, or a phenylenedimaleimide

The formulation can further be comprised of 0.1 weight percent to 10 weight percent of a photoinitiator devoid of thermally activated accelerators based on a total weight of the resulting formulation and forming a durable ambient light curable waterproof liquid rubber formulation devoid of thermally activated accelerators, wherein the formulation is adapted to crosslink and form a waterproof seal on a substrate only in the presence of ultraviolet light.

The formulation can be for a durable ambient light curable waterproof liquid rubber coating with a volatile organic compound content of less than 450 grams per liter.

The formulation can include 40 weight percent to 95 weight percent based on a total weight of a resulting durable ambient light curable waterproof liquid rubber formulation of a liquid ethylene propylene diene terpolymer (EPDM), wherein the polymer has a backbone consisting of from 1 weight percent to 50 weight percent of a non-conjugated diene in a random ethylene propylene copolymer, and further the polymer has a weight average molecular weight less than 60,000, an ethylene propylene ratio from 35:65 to 80:20 ethylene to propylene; a specific gravity of 0.83 to 0.95; and a glass transition temperature of from −60 degrees Celsius to −30 degrees Celsius.

Additionally the formulation can include 0.1 weight percent to 25 weight percent of a solvent based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation, wherein the solvent comprises at least one of:

an aliphatic solvent, an aromatic solvent, a plant-based solvent, and combinations thereof.

Critical in the formulation can be 0.1 weight percent to 10 weight percent based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation of a photoinitiator devoid of thermally activated accelerators.

The photoinitiator can be a type I photoinitiators including bis(2,4,6-trimethylbenzoyl)-phenyl phosphineoxide, 1-hydroxy-cyclohexyl-phenyl ketone and combinations thereof, or a type II photoinitiators including benzophenone; alpha hydroxyl ketone, alpha amino ketone; isothioxanthone; and combinations thereof.

The formulation can include 0.5 weight percent to 10 weight percent of an additive based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation that is an antioxidant, an ultraviolet light stabilizer, and combinations thereof.

The formulation can include 0.25 weight percent to 20 weight percent of a pigment based on a total weight of the resulting durable ambient light curable waterproof liquid rubber formulation.

The formulation can include 0.25 weight percent to 50 weight percent of a filler based on a total weight of the resulting durable ambient light curable waterproof liquid rubber formulation.

The formulation can include 0.01 weight percent to 10 weight percent of a co-agent to the low viscosity liquid intermediate rubber formulation, wherein the co-agent can be selected from the group comprising: an acrylate, a triallyl cyanurate, a polybutadiene, a phenylenedimaleimide, and combinations thereof.

It should be noted that the durable ambient light curable waterproof liquid rubber formulation can be curable with no active heating in the presence of ambient light without addition of another curative, and further wherein the resulting durable ambient light curable waterproof liquid rubber formulation has an uncured viscosity from 1,000 to 50,000 centipoise and a VOC content of 450 grams per liter or less and when cured, the cured coating can have a tensile strength greater than 250 psi when cured, an elongation greater than 50 percent when cured, a Shore A hardness from 40 to 70 when cured, and wherein the durable ambient light curable waterproof liquid rubber formulation when cured can be waterproof with adhesion to a substrate.

In an embodiment, the formulation can use a filler that can be silica, clay, talc, calcium carbonate, aluminum tri hydroxide, other mineral fillers, and combinations thereof.

In an embodiment, the formulation can use a pigment that can be titanium dioxide, zinc sulfide, phthalocyanine blue, naphthol red, azo red, azo yellow, carbon black, iron oxide, and combinations thereof.

In an embodiment, the formulation can use 0.01 weight percent to 30 weight percent based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation of a low molecular weight non-volatile plasticizer that can be silicone oil, aromatic oil, paraffinic oil, naphthenic oil, vegetable oil, diester oil, mineral oil, a low molecular weight polyalphaolefin, and combinations thereof.

In an embodiment, the formulation can include 0.1 weight percent to 3 weight percent of a defoamer based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation comprising a polymethyl alkyl siloxane, butyl glycolate, or a polyethyl glycol monooleate.

In an embodiment, the formulation can use 0.1 weight percent to 3 weight percent of an air release agent based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation comprising a mineral oil, a paraffinic oil, or a silicone oil.

In an embodiment, the formulation can use 0.1 weight percent to 3 weight percent of a biocide based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation comprising a methylchloroisothiazolinone.

In an embodiment, the formulation can use 0.1 weight percent to 5 weight percent of a wetting agent based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation comprising a silicone polyacrylate copolymer in solvent, a solvent-free polyether modified dimethylpolysiloxane, or a 1 methoxy propaynol acetate.

In an embodiment, the formulation can use 0.1 weight percent to 30 weight percent of a flame retardant based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation comprising an alumina-trihydrate.

In an embodiment, the formulation can use 0.1 weight percent to 5 weight percent of an anti-settling agent based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation comprising a hydroxylethyl cellulose.

In an embodiment, the formulation can use 0.1 weight percent to 5 weight percent of a pigment dispersant based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation comprising 1 methoxy-2-propylacetate.

In an embodiment, the formulation can use 0.1 weight percent to 5 weight percent of an adhesion promoter based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation that can be a silane, a zinc di-methyacrylate with or without alkylated phenols, a zinc di-acrylate with an alkylated phenol, a fatty ester, or combinations thereof.

In an embodiment, the formulation can use a hindered amine light stabilizer, benzophenone, benzotriazole, hindered phenolic stabilizer, or combinations thereof as the additive.

In an embodiment, the formulation can use 0.5 weight percent to 10 weight percent based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation of an additive comprising an antioxidant or an ultraviolet light stabilizer.

In an embodiment, the formulation can use as the solvent mineral spirits, a toluene, a hexane, a palm oil, a turpentine, a xylene, or combinations thereof.

In an embodiment, the formulation can use 0.25 weight percent to 20 weight percent of a pigment based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation comprising titanium dioxide, zinc sulfide, phthalocyanine blue, naphthol red, azo red, azo yellow, carbon black, iron oxide, or combinations thereof.

The following procedure relates to an order of addition in one embodiment of a method for making a durable ambient light curable waterproof liquid rubber formulation.

First, mix 50 percent of the total formulation amount of EPDM polymer and 50 percent of the total formulation amount of mineral spirits (a solvent) in a vessel. Mix the components at a temperature from 20 degrees Celsius to 50 degrees Celsius until a smooth homogenous solution is formed.

Add the remaining 50 percent of the total formulation amount of EPDM to the solution and continue mixing at a temperature from 20 degrees Celsius to 50 degrees Celsius until all of the EPDM is thoroughly mixed forming a smooth viscous solution.

Into this smooth viscous solution, slowly add 100 percent of the total amount of filler used in the durable ambient light curable waterproof liquid rubber formulation and 100 percent of the total amount of pigment (if a pigment is used) used in the durable ambient light curable waterproof liquid rubber formulation.

Once the filler and the pigment (if used) are added, mix at a temperature of from 20 degrees Celsius to 50 degrees Celsius until the mixture forms a smooth grind base. The grind base is mixed to from 4 to 8 on the Hegman scale.

Add the remaining 50 percent of the total amount of solvent (specifically mineral spirits) used in the durable ambient light curable waterproof liquid rubber formulation and 100 percent of the total amount of plasticizers used in the durable ambient light curable waterproof liquid rubber formulation to the grind base.

Mix at a temperature from 20 degrees Celsius to 50 degrees Celsius until all of the solvent and plasticizers are thoroughly incorporated into the solution.

Add in 100 percent of the total formulation amount of any additives that may be used, which can include wetting agents, defoamers, antioxidants, hindered amine light stabilizers, UV absorbers, flame retardants, air release agents, biocides, anti-settling agents, pigment dispersants, and adhesion promoters.

Mix at a temperature from 20 degrees Celsius to 50 degrees Celsius until all of the additives are thoroughly incorporated into the solution. The solution is mixed to from a 4 to 8 on the Hegman scale.

Into a separate vessel prepare a solution of 100 percent of a photoinitiator solvent (such as Toluene) and 100 percent of the photoinitiators used in the durable ambient light curable waterproof liquid rubber formulation.

Mix the photoinitiator solvent and the photoinitiators at a temperature from 20 degrees Celsius to 50 degrees Celsius until all of the photoinitiators are dissolved and thoroughly mixed into the solution.

Add 100 percent of the total formulation amount of the photoinitiators solution to the mixture containing the EPDM, solvent (mineral spirits), filler, pigment, and additives.

Mix at a temperature from 20 degrees Celsius to 50 degrees Celsius until all of the components are thoroughly incorporated into the solution and the solution is from 4 to 8 on the Hegman scale.

Example 1

1006-94-2 Component Ingredient % EPDM Polymer Trilene 5131 Lot GE2G015 36.20 Pigment Kronos 2300 1.85 Filler 10WC Woolastocoat 34.39 Solvent Mineral Spirits 20.87 Plasticizer Dow Corning 200 Fluid 0.36 Co-agent SR 540 2.71 Curative Irgacure 819 0.36 Solvent Toluene 3.26 Viscosity (cP) 15900 VOC (gms/L) 258

Example 2

Component Ingredient % EPDM Polymer Trilene 65 Standard 30.72 Polybutadiene Resin Ricon 156 2.56 Solvent Mineral Spirit 15.37 Solvent HMDS Solvent 23.04 Curative Irgacure 819 2.05 Solvent Toluene 8.19 Hindered Amine Light Stabilizer TINUVIN 292 (HALS) 0.15 Pigment TiO2 10.24 Filler Cupsil 6508 Silica 7.68 Estimated VOC g/L 236 Viscosity (cP) 6480

Example 3

Formulation with Defoamer Component Ingredient % EPDM Polymer Trilene 5131 36.20 Pigment Kronos 2300 1.85 Filler 10WC Woolastocoat 34.39 Solvent Mineral Spirits 10.87 Plasticizer Dow Corning 200 Fluid 0.36 Co-agent SR 540 2.71 Curative Irgacure 819 0.36 Solvent Toluene 3.26 Defoamer BYK 052 10.00

Example 4

Formulation with Anti-Settling Agent Component Ingredient % EPDM Polymer Trilene 5131 36.20 Pigment Kronos 2300 1.85 Filler 10WC Woolastocoat 34.39 Solvent Mineral Spirits 10.87 Plasticizer Dow Corning 200 Fluid 0.36 Co-agent SR 540 2.71 Curative Irgacure 819 0.36 Solvent Toluene 3.26 Anti-Settling Agent MPA 1078 10.00

Example 5

Formulation with Flame Retardant Component Ingredient % EPDM Polymer Trilene 5131 36.20 Pigment Kronos 2300 1.85 Filler 10WC Woolastocoat 14.39 Solvent Mineral Spirits 10.87 Plasticizer Dow Corning 200 Fluid 0.36 Co-agent SR 540 2.71 Curative Irgacure 819 0.36 Solvent Toluene 3.26 Flame Retardant ATH 30.00

Example 6

Formulation with Pigment Dispersant Component Ingredient % EPDM Polymer Trilene 5131 36.20 Pigment Kronos 2300 1.85 Filler 10WC Woolastocoat 29.39 Solvent Mineral Spirits 10.87 Plasticizer Dow Corning 200 Fluid 0.36 Co-agent SR 540 2.71 Curative Irgacure 819 0.36 Solvent Toluene 3.26 Flame Retardant ATH 5.00 Pigment Dispersant Nuosperse 9100 10.00

Example 7

Formulation with Biocide Component Ingredient % EPDM Polymer Trilene 5131 36.20 Pigment Kronos 2300 1.85 Filler 10WC Woolastocoat 34.39 Solvent Mineral Spirits 10.87 Plasticizer Dow Corning 200 Fluid 0.36 Co-agent SR 540 2.71 Curative Irgacure 819 0.36 Solvent Toluene 3.26 Biocide Mergal K9N 10.00

Example 8

Formulation with Adhesion Promoter Component Ingredient % EPDM Polymer Trilene 65 30.72 Polybutadiene Resin Ricon 156 2.56 Solvent Mineral Spirits 10.37 Solvent HMDS Solvent 18.04 Curative Irgacure 819 2.05 Solvent Toluene 8.19 Adhesion Promoter SR 634 10.00 Pigment Kronos 2300 10.24 Filler Coupsil 6508 7.83

Example 9

Formulation with Air Release Component Ingredient % EPDM Polymer Trilene 65 30.72 Polybutadiene Resin Ricon 156 2.56 Solvent Mineral Spirits 10.37 Solvent HMDS Solvent 18.04 Curative Irgacure 819 2.05 Solvent Toluene 8.19 Air Release Agent Ultra 1199 10.00 Pigment Kronos 2300 10.24 Filler Coupsil 6508 7.83

Example 10

Formulation with Wetting Agent Component Ingredient % EPDM Polymer Trilene 5131 36.20 Pigment Kronos 2300 1.85 Filler 10WC Woolastocoat 34.39 Solvent Mineral Spirits 10.87 Plasticizer Dow Corning 200 Fluid 0.36 Co-agent SR 540 2.71 Curative Irgacure 819 0.36 Solvent Toluene 3.26 Wetting Agent BYK 378 10.00

While these embodiments have been described with emphasis on the embodiments, it should be understood that within the scope of the appended claims, the embodiments might be practiced other than as specifically described herein. 

What is claimed is:
 1. A method for making a durable ambient light curable waterproof liquid rubber formulation with a volatile organic compound content of less than 450 grams per liter, comprising: a. blending in a closed vessel forming a solution, a first portion of ethylene propylene diene terpolymer (EPDM) with a first portion of solvent, wherein the ethylene propylene diene terpolymer (EPDM) is 50 weight percent to 99 weight percent of a total amount of ethylene propylene diene terpolymer used in a resulting durable ambient light curable waterproof liquid rubber formulation and the first portion of solvent is 33 weight percent to 67 weight percent of a total amount of solvent used in the resulting durable ambient light curable waterproof liquid rubber formulation; b. mixing the solution in a high shear mixer for at least 10 to 240 minutes at a temperature from 20 degrees Celsius to 50 degrees Celsius forming a high viscosity solution; c. adding a second portion of ethylene propylene diene terpolymer (EPDM) to the high viscosity solution, wherein the second portion of ethylene propylene diene terpolymer (EPDM) is 0.1 weight percent to 50 weight percent of the total amount of ethylene propylene diene terpolymer (EPDM) used in the resulting durable ambient light curable waterproof liquid rubber formulation; d. adding a second portion of solvent to the high viscosity solution wherein the second portion of solvent is 33 weight percent to 80 weight percent of a total amount of solvent used in the resulting durable ambient light curable waterproof liquid rubber formulation; e. blending the high viscosity solution for 10 minutes to 120 minutes at a temperature from 20 degrees Celsius to 50 degrees Celsius to form a low viscosity liquid intermediate rubber formulation with a saturated backbone of propylene, a saturated backbone of ethylene, and an unsaturated diene with ultra violet activated sites capable of crosslinking with or reacting with a free radical or a free radical on another terpolymer; f. adding a co-agent to the low viscosity liquid intermediate rubber formulation to accelerate reaction of the free radicals with the active sites of the unsaturated diene to cross link the terpolymer, wherein the co-agent is 0.01 weight percent to 10 weight percent of the resulting durable ambient light curable waterproof liquid rubber formulation and the co-agent comprises at least one of: an acrylate, a triallyl cyanurate, a polybutadiene, and a phenylenedimaleimide; and g. blending the low viscosity liquid intermediate rubber formulation with the co-agent at a low shear rate for 10 minutes to 120 minutes at a temperature from 20 degrees Celsius to 50 degrees Celsius in the absence of ultraviolet light; and h. adding a photoinitiator devoid of thermally activated accelerators to the low viscosity liquid intermediate rubber formulation to generate free radicals that react with the active sites of the unsaturated diene, wherein the photoinitiator is 0.1 weight percent to 10 weight percent of the resulting durable ambient light curable waterproof liquid rubber formulation; forming a durable ambient light curable waterproof liquid rubber formulation devoid of thermally activated accelerators and adapted to crosslink and form a waterproof seal on a substrate only in the presence of ultraviolet light.
 2. The method of claim 1, comprising the step of mixing the photoinitiators in a photoinitiator solvent prior to adding the photoinitiators to the low viscosity liquid intermediate rubber formulation, wherein the photoinitiator solvent is from 1 weight percent to 20 weight percent based on the total solvent content of the resulting durable ambient light curable waterproof liquid rubber formulation wherein photoinitiators include Type I photoinitiators including: bis(2,4,6-trimethylbenzoyl)-phenyl phosphineoxide, and 1-hydroxy-cyclohexyl-phenyl-ketone; and Type II photoinitiators include benzophenone, alpha hydroxyl ketone, alpha amino ketone, isothioxanthone, and combinations thereof, wherein all photoinitiators are devoid of thermally activated accelerators.
 3. The method of claim 1, wherein the first portion of ethylene propylene diene terpolymer has a different molecular weight than the second portion of ethylene propylene diene terpolymer.
 4. The method of claim 1, comprising: a. adding to the high viscosity solution at a temperature from 20 degrees Celsius to 50 degrees Celsius, at least one of: (i) 50 weight percent to 99 weight percent of a pigment; and (ii) 50 weight percent to 99 weight percent of a filler; wherein the amount of the pigment and the filler added represent a total weight percent of pigment and filler in the high viscosity solution; and b. blending the pigment and filler to a particle dispersion from 4 to 8 units on the Hegman scale.
 5. The method of claim 1, further comprising adding to the low viscosity liquid intermediate 0.1 weight percent to 10 weight percent of additives based on a total weight of the resulting durable ambient light curable waterproof liquid rubber formulation and the additives are at least one of: a hindered phenolic stabilizer or a hindered amine ultraviolet stabilizer.
 6. The method of claim 1, further comprising: adding to the low viscosity liquid intermediate 0.1 weight percent to 10 weight percent of an adhesion promoter based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation after adding the second portion of ethylene propylene diene terpolymer (EPDM) to the high viscosity solution, wherein the adhesion promoter is at least one of: a zinc diacrylate or zinc dimethacrylate.
 7. The method of claim 1, further comprising: adding to the low viscosity liquid intermediate rubber formulation: 0.1 weight percent to 10 weight percent of a pigment dispersant based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation, wherein the pigment dispersant is 1 methoxy-2-propylacetate.
 8. The method of claim 1, further comprising: adding to the low viscosity liquid intermediate rubber formulation: 0.1 weight percent to 10 weight percent of an anti-settling agent based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation, wherein the anti-settling agent is at least one of a hydroxylethyl cellulose and a fumed silica.
 9. The method of claim 1, further comprising: adding to the low viscosity liquid intermediate rubber formulation 0.1 weight percent to 10 weight percent of a defoamer based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation, and wherein the defoamer is at least one of: a polymethyl alkyl siloxane, a modified polysiloxane, and a polymethylsiloxane in a solvent.
 10. The method of claim 1, further comprising adding to the low viscosity liquid intermediate rubber formulation 0.1 weight percent to 10 weight percent of an air release agent based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation, wherein the air release agent comprises at least one of: a mineral oil, a paraffinic oil, a silicone oil, or a similar oil.
 11. The method of claim 4, further comprising: adding 0.1 weight percent to 30 weight percent of a flame retardant to low viscosity liquid intermediate rubber formulation, based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation, wherein the flame retardant comprises: an alumina trihydrate, by adding: a. with a member of at least one of: a pigment, a filler, and an additives to the low viscosity liquid intermediate rubber formulation; or b. after the second portion of ethylene propylene diene terpolymer is added to the high viscosity solution.
 13. The method of claim 1, further comprising: adding to the low viscosity liquid intermediate rubber formulation 0.1 weight percent to 12 weight percent of a wetting agent based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation, wherein the wetting agent is at least one of: a silicone polyacrylate copolymer in solvent and a solvent-free polyether modified dimethylpolysiloxane.
 14. The method of claim 1, further comprising: adding to the low viscosity liquid intermediate rubber formulation 0.1 weight percent to 10 weight percent of a biocide based on the total weight of the resulting durable ambient light curable waterproof liquid rubber formulation, wherein the biocide is a methylchloroisothiazolinone.
 15. The method of claim 1, further comprising: adding 0.1 weight percent to 30 weight percent of a low molecular weight non-volatile plasticizer low viscosity liquid intermediate rubber formulation after the second portion of solvent is added to the high shear mixture, wherein the low molecular weight non-volatile plasticizer comprises: a paraffinic oil, naphthenic oil, plant based oil, diester oil, silicone oil, a mineral oil, a low molecular weight polyalphaolefin, or combinations thereof.
 16. The method of claim 1, wherein the first portion of solvent and the second portion of solvent are selected from the group: mineral spirits and hexamethyldi-siloxane.
 17. The method of claim 16, wherein the first portion of solvent and the second portion of solvent can be different solvents.
 18. A method for making a durable ambient light curable waterproof liquid rubber coating formulation with a volatile organic compound content of less than 450 grams per liter, comprising: a. blending in a closed vessel forming a solution, a first portion of ethylene propylene diene terpolymer (EPDM) with a first portion of solvent, wherein the ethylene propylene diene terpolymer (EPDM) is 50 weight percent to 99 weight percent of a total amount of ethylene propylene diene terpolymer and the first portion of solvent is 33 weight percent to 67 weight percent of a total amount of solvent used in a resulting formulation; b. adding to the solution: (i) 0.25 weight percent to 20 weight percent of a pigment based on a total weight of the resulting formulation; and (ii) 0.25 weight percent to 50 weight percent of a filler based on a total weight of the resulting formulation to form a mixture; c. mixing the mixture in a high shear mixer at a temperature from 20 degrees Celsius to 50 degrees Celsius until the mixture forms a grinding base with a Hegman scale value from 4 to 8 with dispersed pigment and filler; d. adding a second portion of ethylene propylene diene terpolymer (EPDM) to the grinding base, wherein the second portion of ethylene propylene diene terpolymer (EPDM) is 1 weight percent to 50 weight percent of the total amount of ethylene propylene diene terpolymer (EPDM) used in a resulting durable ambient light curable waterproof liquid rubber coating formulation; e. adding a second portion of solvent to the grinding base and blending until all components are uniformly blended at a temperature from 20 degrees Celsius to 40 degrees Celsius forming an intermediate, wherein the second portion of solvent is 33 weight percent to 67 weight percent of the total amount of solvent used in a resulting formulation; f. adding 0.01 weight percent to 10 weight percent of a co-agent to the intermediate, wherein the co-agent is comprises at least one of: an acrylate, a triallyl cyanurate, a polybutadiene, or a phenylenedimaleimide, and blending the intermediate with the co-agent at a low shear rate for 10 minutes to 120 minutes at a temperature from 20 degrees Celsius to 40 degrees Celsius in the absence of ultraviolet light; and g. adding 0.1 weight percent to 10 weight percent of a photoinitiator devoid of thermally activated accelerators to the intermediate and forming a durable ambient light curable waterproof liquid rubber formulation devoid of thermally activated accelerators, wherein the formulation is adapted to crosslink and form a waterproof seal on a substrate only in the presence of ultraviolet light. 